CVE-2026-80977

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: skbuff: don't touch shared zerocopy state in skb_tx_error()

skb_tx_error() completes the zerocopy uarg and clears

SKBFL_ALL_ZEROCOPY, and skb_zcopy_downgrade_managed() clears

SKBFL_MANAGED_FRAG_REFS. Both live in skb_shinfo(), which every clone

shares, while the caller only owns the reference it is about to drop.

Through a clone it tells the producer its pages are free and drops

SKBFL_SHARED_FRAG for an skb that is still in flight.

Open vSwitch reaches this with a non-last OVS_ACTION_ATTR_RECIRC:

clone_execute() sends a skb_clone() into ovs_dp_process_packet() while

do_execute_actions() keeps forwarding the original, and skb_clone()

does not privatise the frags here -- skb_orphan_frags() returns early

on SKBFL_DONT_ORPHAN. A flow miss on the clone then strips the marker

from the packet still being forwarded, and a later local ESP delivery

decrypts in place over frags it does not own privately.

Skip it for a cl

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References